Common Shares and Net (Loss) Income Per Common Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		9 Months Ended
	Jun. 29, 2016	Mar. 09, 2016	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net proceeds from offering of common stock			$ 2.4	$ 0.5	$ 366.6	$ 143.1
March 2016 Offering [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Number of shares issued in offering		12,765,000
Public offering price per share		$ 11.80
Net proceeds from offering of common stock		$ 150.6
Underwriter commissions		6.0
Professional fees		$ 0.8
June 2016 Offering [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Number of shares issued in offering	15,088,000
Public offering price per share	$ 15.25
Net proceeds from offering of common stock	$ 230.1
Underwriter commissions	9.2
Professional fees	$ 1.1